Wordpress Custom menu icon

I need to change the home icon for a menu, I have followed this tutorial,

But cant seem to get the Icon to appear, I have set the css in the wordpress to inicio, and added the following code to css:

#access .inicio a {
background-color: white;
background:url(http://www.podologolanzarote.es/wp-content/uploads/2012/10/home-icon.png) no-repeat 0.5em 0.5em;

but just cant get it to appear, I think it must be the wrong id in the css, but when I try others its the same.

Thank you